Answer:
a. 500J
Problem:
While a gas does 400J of work on its surroundings, 900J of heat is added to the gas. What is the change in the internal energy of the gas?
Given:
Q (heat added) = 900 J
W (work done) = 400 J
U (internal energy) = ? unknown
Solution:
To find internal energy, you have to subtract heat from work. U=Q-W
U=Q-W
900 J
= 500 J
400 J
Answer:
U (internal energy) = 500 J
This problem can be solve using the first
law of thermodynamics.
The first law tells us that a system's internal energy can be changed by transferring energy by either work, heat or a combination of the two.
Heat can cause the internal energy of the
water to increase. When heat flows in instances where
the work done is negligible, the internal energy of the hot substance decreases and the internal energy of the cold substance increases. While heat may originate in the internal energy supply of a substance, it is not correct to say that a substance contains heat. The substance has internal energy, not heat. The word "heat" is used only when referring to the energy actually in transit from hot to cold.
Explanation:
Ps: This is not mine thankyou
